Impossible to send email with Icedove

Dear all,
I have foolow the different stages without any problem. All I think run fine when I try to compose an email with icedove. Until this stage all is ok. After composing the email I click on send. A window tells me "The message is copying to the sent directory" and the email doesn't go. Directly I go to mail.log and see the messages below.

Can you please explain me the problem and help me to solve it.
Nota : when I send email via console mode I haven't got error but I can retry the email with icedove (send/receive anything in the mailbox)

As you can see Google MTA (gmail-smtp-in.l.google.com) accept the email not Arobase Telecom MTA (mail.arobasetelecom.ci) which reject the sender address.
Can you help me to avoid this error ? and find a solution for the first bug I've posted ?

I have manually create the directories :
/home/vmail/dpi-arobasetelecom.ci (chown vmail.vmail)
/home/vmail/dpi-arobasetelecom.ci/admins (chown vmail.vmail)
After this the system required the directory "cur" which I create manually. This permit to log on the server. But I can receive any email .

hi Falko,
It's right that there's no A record for my hostname via the command :
dig marina.dpi-arobasetelecom.ci execute on an Internet machine.
Because my server is a local MTA for our organization unit. Now I must make all the tests and if they are ok I will ask my ISP to provide us a public IP address.
In local I have this :

After you've gotten you public static IP address, you should create a hostname for it that points to your public IP and use that hostname in your Postfix configuration as well, because other mail servers can't resolve your internal hostname.

Hello Falko,
I found the solution with my problem with the assistance of the community Forum Debian <[email protected]>. For having to carry out the command below
mysql> select * from transport;
+-----------------------+---------------------------------+
| domain | transport |
+-----------------------+---------------------------------+
| dpi-arobasetelecom.ci | smtp:mail.dpi-arobasetelecom.ci |
+-----------------------+---------------------------------+
1 row in set (0.00 sec)

mysql> delete from transport;
Query OK, 1 row affected (0.08 sec)

mysql> select * from transport;
Empty set (0.00 sec)

It was just necessary to remove the line dpi-arobasetelecom.ci | smtp:mail.dpi-arobasetelecom.ci | from the table transport so that the local emails are delivered.
Thank you once again for patience and your support.